Safety double lock

Tools and hardware – Locking or closing device – Lock – latch or bolt

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Patent

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D03713008

REFERENCES:
patent: D339057 (1993-09-01), Lofland
patent: 4680948 (1987-07-01), Stewart
patent: 5109683 (1992-05-01), Cartwright
"Safety Lockouts," Hoffman Engineering Company advertising brochure, p. 507 .COPYRGT.1995.

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